DARLEY ZSP, Nstallation, Operation, Maintenance, Repair And Troubleshooting Instructions

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Prepared by: RJG Rev. #: A
Revised by: JAF Date: 03/23/12
Approved by: WAH 1200644
Revision Date:14AUG13
Priming Procedure:
To prime the pump a certain amount of dry running of the pump along with a recommended
engine speed are given. Significant testing has proven these figures at W.S. Darley and
should never be exceeded without W.S Darley Customer Service approval.
Priming time should not exceed 80 seconds. If pump fails to prime within 80 seconds, shut
down and thoroughly inspect the pump system for air leaks and resolve the issue before
attempting to re-prime.
Engine speed during priming should NOT exceed 1000 RPM regardless of the pump and/or
PTO ratio in relation to engine speed.
To Prime: Engage the pump per the shifting procedure outlined in Section 2, and ramp engine
speed to no more than 1000 RPM. Pres
s the “Push-to-Prime” momentary switch and hold.
Prime should occur within 80 seconds. Indication of Prime should be noticed when water
discharges from the primer pump exhaust port. Releasing the momentary switch will
disengage the primer clutch and close the primer ¼ turn ball valve. Prime should now be
attained and contained.
Under normal conditions, the primer
will evacuate the pump and 20’ of 8” hose within 24
seconds.
As soon as prime is reached the pump will develop pressure.
When pumping from hydrants, the primer is not needed and must be kept closed.
It may be necessary to use the primer momentarily when pumping from a booster tank when
the suction head is insufficient to force all the air out of the pump.
Lubricating System
– Electric Priming Pump with Fluid Reservoir
The electrically-clutched belt-driven rotary-vane primer pump creates a high vacuum by
continuous lubrication of rotor and vanes. Therefore the primer lubricant supply tanks (4
quarts) should be kept full at all times.
Recommended primer system lubricant is Darley PRIME GREEN. PRIME GREEN is an
environmentally safe, non-toxic, biodegradable lubricant. Its use assures proper primer
vane lubricant while minimizing environmental effects.
After the main pump is drained, run the primer motor to drain primer lines and re-lubricate the
primer pump.
The vent-hole on the lubricant tank cap should be kept open at all times to prevent siphoning of
lubricant from the tank after the pump is stopped. Do not increase the size of this hole.
Locate the lubricant tank where it may be conveniently inspected and filled.
Should water appear in the lubricant supply tank, the primer valve is leaking. Check and
replace valve plug seal o-rings as necessary.